NBM Dive Site Resource
Illinois and Holly Barges
Chicago, Illinois, United States
Two connected shallow wreck sites associated with Chicago-area industrial work, published by Double Action Dive Charters for SeaQuest II trips.
Save this dive site to your free member profile.
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Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Seasonal planning reference
Typical monthly conditions
Long-term averages, not a forecast. Actual air and water conditions can change quickly and may vary across the site.Moderate-confidence match — Matched by documented Great Lakes port/area. Air and surface-water values are regional planning averages. No bottom-water line is published because a comparable depth-specific record has not yet been verified.
| Month | Average air | Surface water | Bottom water | Bottom measurement depth |
|---|---|---|---|---|
| Jan | 25.2°F / -3.8°C | 35.2°F / 1.8°C | No reliable record | — |
| Feb | 28.8°F / -1.8°C | 36.6°F / 2.6°C | No reliable record | — |
| Mar | 39.0°F / 3.9°C | 37.8°F / 3.2°C | No reliable record | — |
| Apr | 49.7°F / 9.8°C | 38.3°F / 3.5°C | No reliable record | — |
| May | 60.6°F / 15.9°C | 42.5°F / 5.8°C | No reliable record | — |
| Jun | 70.6°F / 21.4°C | 53.7°F / 12.1°C | No reliable record | — |
| Jul | 75.4°F / 24.1°C | 68.2°F / 20.1°C | No reliable record | — |
| Aug | 73.8°F / 23.2°C | 72.2°F / 22.3°C | No reliable record | — |
| Sep | 66.3°F / 19.1°C | 68.4°F / 20.2°C | No reliable record | — |
| Oct | 54.0°F / 12.2°C | 58.5°F / 14.7°C | No reliable record | — |
| Nov | 41.3°F / 5.2°C | 49.0°F / 9.4°C | No reliable record | — |
| Dec | 30.5°F / -0.8°C | 43.7°F / 6.5°C | No reliable record | — |
NOAA NCEI 1991–2020 U.S. Climate Normals — Chicago O’Hare, IL
1991–2020 climate normalsReview source ↗NOAA NCEI Coastal Water Temperature Guide — Station 45007
Historical monthly station averagesReview source ↗Bottom temperature is never inferred from surface temperature. A blank month means no reliable depth-specific average is available. Data reviewed 2026-08-26.
Why divers know this place
Highlights
Two shallow industrial wrecks that can be explored in a single outing.
Shipwreck-only module
The wreck
This section appears only on shipwreck records and brings the vessel, its loss, present condition, access, and responsible wreck-diving considerations into one place.
- Vessel type
- Hydraulic dredge/tug and barge
- Year sunk
- 1907 for Illinois
- Cause of loss
- Illinois was lost in a storm while working as a tug and dredge
- Present condition
- Two shallow wreck sites in close proximity
- Penetration guidance
- Watch for entanglement and unstable industrial structure
History and significance
Illinois was once the largest hydraulic dredge on Lake Michigan; the nearby Holly barge adds a second site to the dive.
Before you arrive
Access notes
Confirm the selected wreck, departure, current conditions, mooring status and diver requirements directly with the operator.
Plan within your training
Conditions and hazards
Cold water, changing visibility, boat traffic, entanglement and fragile or unstable wreck structure. Depth-specific decompression and overhead hazards may apply.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.